安徽金寨县沙坪沟 斑岩钥矿床成矿流体演化特征*

南京大学学报(自然科学版) ›› 2012, Vol. 48 ›› Issue (3): 240–255.

安徽金寨县沙坪沟
斑岩钥矿床成矿流体演化特征*

于文¹，倪培^1**，王国光¹，商力¹，江来利²，王波华³，张怀东³

出版日期:2015-05-29 发布日期:2015-05-29
作者简介: (1.南京大学内生金属矿床成矿机制研究国家重点实验室，地质流体研究所，地球科学
与工程学院，南京，210093;2.安徽省地质矿产勘查局，合肥，230001;
3.安徽省地质矿产勘查局313地质队，六安,237010)
基金资助:
安徽省公益性地质(科技)项日(2009-19)

Evolution of ore-forming fluids of the Shapinggou porphyry
molybdenum deposit，Jinzhai，Anhui province

Yu Wen ¹，Ni Pei¹,Wasg Guo一guang¹，Shang Li¹，Jiung Lai一Li²

Online:2015-05-29 Published:2015-05-29
About author: (1 .State Kcy Laboratory for Mineral Deposit Research，institute of Geo-Fluids, School of Earth Sciences and
Engineering, Nanjing University, Nanjing, 210093，China; 2. Anhui Bureau of Geology and
Mineral Exploration, Hefei，230001，China; 3. Geological Survey 303，Anhui Bureau of Geology
and Mineral Resources，Anhui 237010，China)

摘要/Abstract

摘要： 本文通过对安徽金寨县沙坪沟斑岩铝矿床不同蚀变一矿化带石英脉中的流体包裹体岩相学、显微测温学和显微激光拉曼探针等系统研究，来探讨成矿流体的特征和演化过程.研究结果显示该矿床主要发育三类流体包裹体:气一液两相包裹体(I 型)，富气相包裹体(II 型)，多相包裹体(III 型).成矿早期硅化带中的石英主要发育I 型包裹体，均一温度平均为422 ?C，盐度平均为13.77 wt%NaCI.主成矿期钾化带中的石英则主要发育II 型和III 型包裹体，其平均均一温度和盐度分别为333?C、4.04wt%
NaC1;350?C,41. 85 wt% NaCI.主成矿期黄铁绢英岩化带石英中也发育II型和III 型包裹体，II 型包裹体的均一温度平均为296?C，盐度平均为2. 91 wt% NaCI ; III 型包裹体爆裂温度范围为220?C -315?C，盐度大于32. 92 wt%~39. 34wt% NaCI.而成矿晚期绿泥石化带则发育I 型包裹体，其均一温度平均为255?C，盐度平均为2. 82 wt % NaCI.从成矿早期到成矿晚期，成矿流体的均一温度呈下降的趋势.主成矿期钾化带和黄铁绢英岩化带石英脉中富气相包裹体与多相包裹体密切共存，两者的平均均一温度非常相近，但盐度相差很大，表明该阶段成矿流体曾发生过沸腾作用.显微激光拉曼探针分析显示，在沸腾包裹体群中II 型包裹体含有CO₂，而III 型包裹体仅含极少量或者不含CO₂，这表明在流体减压沸腾过程中，可能存在CO₂与水的不混溶过程，从而产生含CO2的低盐度且型包裹体和贫CO₂的高盐度III 型包
裹体两个端员.沸腾作用和CO₂的不混溶作用是矿质沉淀的主要机制.成矿早期硅化带石英脉中的流体包裹体含有CO2，主成矿期钾化带以及黄铁绢英岩化带石英脉中的流体包裹体亦含CO₂，成矿晚期绿泥石化带石英脉中的流体包裹体中仅含有水蒸汽，这表明了成矿流体经历了从早期富含CO2到晚期仅含有水蒸气的演化过程.

Abstract: Based on the detailed petrographic, microthermometric and Raman analysis on the fluid inclusions in the quartz veins from the Shapinggou porphyry molybdenum deposit，Jinzhai，Anhui province, we try to constrain the characteristics and evolution of ore-formin, fluids. Our results show that three types of fluid inclusions exist:liquid (H2O)一rich fluid inclusions (type I)，gas-rich fluid inclusions(type II )，and multiphase fluid inclusions (type III ).In the silica alteration zone，the average homogenization temperature and salinity of type I fluid inclusion are 422?C and 13. 77 wt% NaCI;in the K-feldspar alteration zone, the homogenization temperatures and salinitics of types，II,III fluid inclusions are 333?C，350?Cand 4.04 wt% NaCI，41. 85 wt% NaCI，respectively; in the pyrite sericite alteration zone, the homogenization temperatures and salinitics of type II fluid inclusion are 296?C and 2. 91 wt % NaCI，the decrepitation temperature of type III fluid inclusion is among 220?C一315?C and the salinity of type III fluid inclusion is>32. 92一39. 34wt% NaCI;in the chlorite alteration zone the homogenization
temperature and salinity of type l fluid inclusion is 255?Cand 2. 82 wt% NaCI，and the homogenization temperature decreased with the time.Types II and III fluid inclusions in the same areas have generally similar homogenization temperatures and distinct salinitics, implying boiling ore-forming fluids at this stage. Raman spectra of these assemblage of boiling fluid inclusions indicate CO₂ is rich in some types I and II fluid inclusions but rare in type III fluid inclusions, which can be explained that at the time of boiling。of ore-forming fluids，CO2 and water are immisciblce. Boiling and immiscibility of fluid are very important for mineralization.The fluid inclusions at the early stage contain CO₂,and at the ore-forming stage also contain CO₂，but at the late stage only contain H₂O
Therefore, the ore-forming fluids have experienced a vanance from rich in CO₂ at the early phase to rich in H₂O at the late phase.

于文¹，倪培^1**，王国光¹，商力¹，江来利²，王波华³，张怀东³
. 安徽金寨县沙坪沟
斑岩钥矿床成矿流体演化特征*[J]. 南京大学学报(自然科学版), 2012, 48(3): 240–255.

Yu Wen ¹，Ni Pei¹,Wasg Guo一guang¹，Shang Li¹，Jiung Lai一Li²
. Evolution of ore-forming fluids of the Shapinggou porphyry
molybdenum deposit，Jinzhai，Anhui province[J]. Journal of Nanjing University(Natural Sciences), 2012, 48(3): 240–255.

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